diff --git a/Makefile b/Makefile
index fda9a41..53a4790 100644
--- a/Makefile
+++ b/Makefile
@@ -15,9 +15,9 @@ obj-cg    := $(src:src/%=build-cg/%.o)
 # Compiler paths
 define compilerpath
 ifneq "$(lib-$1)" ""
-prefix-$1 := $$(shell $(target-$1)-gcc -print-search-dirs | grep install | \
+PREFIX-$1 := $$(shell $(target-$1)-gcc -print-search-dirs | grep install | \
                       sed 's/install: //')
-ifeq "$$(prefix-$1)" ""
+ifeq "$$(PREFIX-$1)" ""
 $$(error "Cannot determine $1 compiler install path")
 endif
 endif
@@ -60,12 +60,12 @@ distclean: clean
 
 install:
 	if [[ ! -z $(lib-fx) ]]; then \
-	  cp $(lib-fx) $(prefix-fx); \
-	  cp $(header) $(prefix-fx)/include; \
+	  cp $(lib-fx) $(DESTDIR)$(PREFIX-fx); \
+	  cp $(header) $(DESTDIR)$(PREFIX-fx)/include; \
 	fi
 	if [[ ! -z $(lib-cg) ]]; then \
-	  cp $(lib-cg) $(prefix-cg); \
-	  cp $(header) $(prefix-cg)/include; \
+	  cp $(lib-cg) $(DESTDIR)$(PREFIX-cg); \
+	  cp $(header) $(DESTDIR)$(PREFIX-cg)/include; \
 	fi
 
 .PRECIOUS: %/